If the ratio of red to blue is 3:5 and red equals 30, blue equals what?

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Multiple Choice

If the ratio of red to blue is 3:5 and red equals 30, blue equals what?

A ratio shows how many parts each color has in relation to the other, so you scale from the given red value to find blue. If red:blue = 3:5 and red is 30, each part is 30 ÷ 3 = 10. Blue is 5 parts, so blue = 5 × 10 = 50. Blue equals 50. Other numbers would require a different scale per part, which would not keep red at 30.

A ratio shows how many parts each color has in relation to the other, so you scale from the given red value to find blue. If red:blue = 3:5 and red is 30, each part is 30 ÷ 3 = 10. Blue is 5 parts, so blue = 5 × 10 = 50. Blue equals 50. Other numbers would require a different scale per part, which would not keep red at 30.

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